立方体中两个面的二面角

GeoGebra 命令及参数

1. Point(Circle[B, Distance[A, B], Segment[A, B]]) → C
2. Cube(A, B, C) → a, D, faceCDHG, faceEFGH, edgeAD, edgeAB, edgeBC, edgeCD, edgeAE, edgeDH, edgeEH, edgeEF, F, edgeBF, edgeFG, edgeCG, edgeGH, G, H, E, faceABCD, faceADHE, faceABFE, faceBCGF
3. Polygon(D, B, G) → poly1, g, d, b
4. Polygon(D, C, G) → poly2, g_1, d_1, c
5. OrthogonalPlane(B, c) → e
6. Intersect(c, e) → I
7. Segment(D, I + (0.05 * (D - G))) → f
8. Segment(G, I + (0.05 * (G - D))) → h
9. Point({f, I, h}) → J
10. Segment(B, J) → j
11. Angle(D, J, B) → α
12. OrthogonalPlane(J, b) → i
13. Intersect(d_1, i) → K
14. Segment(G, K + (0.05 * (G - C))) → k
15. Segment(C, K + (0.05 * (C - G))) → l
16. Point({l, K, k}) → L
17. Segment(L, J) → m
18. Segment(B, J) → n
19. Angle(L, J, G) → β
20. Angle(B, J, L) → γ